Preheat oven to 325 degrees. Line an 8x8 metal baking pan with parchment paper. This will help to avoid the brownies sticking to the bottom of the pan. In a large bowl, add melted butter, sugar, eggs, and vanilla.
Cream together until smooth. Scrape down the bowl with a rubber spatula. In a medium bowl, whisk together the dry ingredients, flour, cocoa, and salt.
Working in batches, spoon the flour mixture into the wet batter. Beat until fully combined. Add a tablespoon of water at a time into the batter to thin a bit if needed.
Pour brownie batter into prepared pan. Spread out evenly. Bake for 40-50 minutes. Or using the toothpick test, by inserting a toothpick into the center of the brownies and it comes out clean. Let brownies cool for 45 minutes before slicing.
Notes
Use a metal pan for this recipe.
You can add more water to the batter. Do so by 1 tablespoon at a time if you would like the brownie batter to loosen up.